The mercury is on the rise this week, with BBC Weather currently predicting a top temperature of 35°C for St Albans on Thursday.
Temperatures are predicted to fall back into the 20s by Friday and for the weekend.
The UK may potentially beat its record temperature of 38.5°C, from August 2003. The all-time July record of 36.7°C, from 2015, is even more likely to be beaten.
Chief meteorologist for the Met Office, Paul Gundersen, said: "The UK will experience another pulse of high temperatures this week, with the possibility of records being broken for not only July but also all-time records. Conditions will feel much more comfortable for all by the time we get to Friday."
Public Health England's website gives advice on staying safe during high tempratures: "Prevention is the best bet here and our advice has three parts - keep hydrated, keep your home cool and keep yourself cool."
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